what is (x+3)° + (4x-2)

The expression (x+3)° + (4x-2) is not a valid mathematical expression.

The degree symbol (°) is typically used to denote angles, not in algebraic expressions.
If you remove the degree symbol, then the expression would be (x+3) + (4x-2), which is a valid expression.

To solve this expression, you would combine like terms by adding the coefficients of x.
(x+3) + (4x-2) = x + 3 + 4x - 2 = (x + 4x) + (3 - 2) = 5x + 1